Has someone already asked for a refund at this late stage of developement?
Boom! Another one bites the dust.
Those who ask for a refund now at least get their investment back, those who don't will be most likely looking at a negative ROI. Gonna be interesting to watch.

Boom! Another one bites the dust.
Refund = 100% ROI within days
Mining = 100% ROI in 4 - infinity months

Disclaimer: no horse in this race ... don't base your descisions on my posts yadda yadda yadda ...